/Engine/Source/Editor/MeshPaint/Public/BaseMeshPaintGeometryAdapter.h
Retrieves the influenced vertex indices which intersect the given sphere
virtual void GetInfluencedVertexIndices ( const float ComponentSpaceSquaredBrushRadius, const FVector & ComponentSpaceBrushPosition, const FVector & ComponentSpaceCameraPosition, const bool bOnlyFrontFacing, [TSet](API\Runtime\Core\Containers\TSet)< int32 > & InfluencedVertices ) const